Testing whether your ISP is throttling Bittorrent used to be a rather complicated undertaking. The EFF came up with a guide that, among other things, asks you to "disable TCP and UDP checksum offloading and TCP segmentation offloading." Riiight.

The Live CD previously mentioned on P2P Blog simplified tests quite a bit, but it still involved teaming up with another user of the same ISP. But things are becoming even easier with a new web-based tool developed at the Max Planck Institute for Software Systems in Saarbruecken, Germany.

test your isp

From its website:

"This test suite creates a BitTorrent-like transfer between your machine and our server, and determines whether or not your ISP is limiting such traffic. This is a first step towards making traffic manipulation by ISPs more transparent to their customers."


Users just have to run a Java applet on their machine that tries to up- and download data via Bittorrent to and from the Institute's server. The tool tests different ports, so users will know whether their ISP is just blocking a certain port or interfering will all Bittorrent transfers.

comcast bittorrent throttling

P2P Blog tested the tool from residential Comcast line, and it accurately diagnosed a manipulation of the upload traffic. So how is your provider doing? Go ahead, run the test and let us know in the comment section!

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